328 



D.-. R. D. Kleeman on Relations between the 



complete data used for these calculations and others in this 

 paper can be obtained from the tables of density and pressure 

 data of Ramsay and Young given in papers by Mills* ; part 

 of the data (taken from this source) can be obtained from a 

 previous paper by the writer f. It will be seen that the 



value of -^ is very approximately independent of the tem- 

 perature for each liquid. Table II. contains the mean values 



Table II. 



Name of 



substance. 



B 



iu d * 



3T C 



lovf 



^i(T). 



1/3 



PJLi3-\ogpc). 



E. 



T c . 



Pc2x 2-303. 



Ethyl oxide 



Pentane 



2-24 

 2-33 

 200 

 2-88 

 2-54 

 2-72 

 2-64 

 2-60 

 2-53 

 2-05 

 2-76 

 2-40 

 2-70 

 1-20 

 2-51 

 202 

 2-42 

 2-61 

 1 61 

 2-13 

 2-62 

 212 



2-20 

 2-29 

 1-96 

 2-78 

 251 

 263 

 2-59 

 2-56 

 2-47 

 2 03 

 2-64 

 2-35 

 2-66 

 1-43 



2 : 37 

 2-54 



2*23 

 2-48 

 2-07 



•930 

 •912 



1-08 

 •916 

 •950 

 •914 



1-08 



103 



1-07 



1-02 

 •918 

 •952 

 •983 

 •991 

 •953 



1-09 

 ■972 



1-23 



1-05 



1-00 

 •933 

 •969 



•931 



•916 

 1-29 



•914 



•939 



•915 

 1-22 

 1-23 



•914 

 1-27 



•915 



•938 



•977 



•972 



•953 

 •929 



•942 



•934 

 •951 



1 



1507 

 1951 



237 

 2393 

 1357 

 2246 



463-4 



6210 

 2094 



403-7 

 2247 

 1239 

 1049 



322-7 



1001 

 1661 



1092 

 1410 

 893-9 



1496 

 1940 



233-4 

 2282 

 1316 

 2138 



462 9 



617-7 

 2011 



388-2 

 2109 

 1266 

 1118 



306-8 



968-7 

 1604 



1102 

 1447 

 869-0 



Stannic chloride ... 

 Octane 



Benzene 



Heptane 



Iodo-benzene 



Broruo-benzene 



Hexane 



Carbon tetrachloride 

 Di-isobutyl 



Etbyl acetate 



Ohlorobenzene 



Carbon dioxide 



Acetone 



Chloroform 



Fluor-benzene 



Hexamethylene 



Sulphur dioxide . . . 



Ethyl formate 



Ethyl propionate . . . 

 Methyl formate 



of zrjr s of each liquid and the corresponding values of 



- , ~ c . .. . The agreement between the two sets of values is 

 I0 6 p] 13 ° 



very good. The values of p c and T c used to calculate the 

 value of the above expression are given in Table IY. 



Several results of interest and usefulness may be deduced 

 from equation (1). It may be expressed as two equations 

 thus : 



pfT, . /mx , M p l J*T 



Pi 3 



-\o gPi = ti(T), pT ~%^ log* = *i(T), 



m 



where ^i(T) is an appropriate function of T. Now it was found 



* Journ. Phys. Chera. vol. viii. p. 405 (1904;. 

 t Phil. Mag." Oct. 1910, pp. 679-681. 



